Pump attachment for portable drills



PUMP ATTACHMENT FOR PORTABLE DRILLS Filed May 15, 1964 ited States Pat Ofiace 3,247,804 PUMP ATTACHMENT FOR PORTABLE DRILLS Thomas A. Behan, 405 Johnson Ave., Union Beach, N.J., and Robert C. Wei-line, 97 Elm Ave., Rahway, NJ. Filed May 15, 1964, Ser. No. 367,745

' Claims. Cl. 103-152) This invention relates to. diaphragm type pumps and more particularly to a diaphragm pump attachment for electric drills and the like.

It is an object of the present invention to provide a pump attachment which will be of the differential in pressure type and will be used as an air pump for inflation purposes or may be used for pumping liquids.

Another object of the present invention is to provide a pump attachment which will have clamp means to secure it to an electric drill or motor which will serve as drive means for the pump attachment.

Another object of the present invention is to provide a pump attachment which will have a reciprocating rod and worm gear means to effect an alternate action of a pair of spaced apart diaphragms to deliver air or fluid under pressure through an outlet pipe.

A further object of the present invention is to provide a pump attachment which will have check valve means within the inlet to prevent the return flow of air or fluid.

A still further object of the present invention is to provide a pump attachment to which may be attached its own power unit or motor if desired.

Other objects of the invention are to provide a pump attachment bearing the above objects in mind which is of simple construction, has a minimum number of parts, is inexpensive to manufacture and efiicient in operation and use.

For other objects and for a better understanding of the invention, reference may be had to the following detailed description taken in conjunction with the accompanying drawing, in which:

FIGURE 1 is a top plan view of the present invention shown in section;

FIGURE 2 is a side view of FIGURE 1 shown in elevation and in section; and

FIGURE 3 is a plan view of the outlet pipe shown removed from the invention.

Referring now more in detail to the drawing, a pump attachment made in accordance with the present invention is shown to include an elongated housing 12 made of metal or other suitable material having an elongated rectangular configurated plate 14 which is fixedly secured to one side of housing 12 at one end and is fixedly secured to a clamp 16 which provides a means for attaching housing 12 to an electric drill or motor. Clamp 16 is provided with a thumb screw 18 which is threadingly received upon a threaded bolt 20 which provides a means for securing clamp 16 to an electric drill or motor. A drive shaft 22 which is driven by an electric drillor motor (not shown) is freely and rotatably received within opening 24 of housing 12 and the other end of shaft 22 is freely and rotatably received within a bushing 26 which is secured within an internal projection 28 of housing 12 to provide support means for shaft 22. A worm 30 is fixedly secured to drive shaft 22 and toothingly engages worm gear 32. Worm gear 32 is freely and rotatably received upon shaft 34 which is secured within an internal projection 35 of housing 12 to provide rigid support means for shaft 34. An offset pin 36 of worm gear 32 is freely and slidably received within an elongated slot 38 of an elongated reciprocating rod 40 within housing 12. A fulcrum pin 42 is pivotally received within reciprocating rod 40 in alignment with pin 36 and fulcrum pin 42 is fixedly secured to an internal bracket 44 within housing 12. A pair of oppositely opposed arms 46 are secured by pivot pins 48 to the end of reciprocating rods 40 and the other ends of rod arms 46 are secured to a circular plate 50 by means of pivot pins 52. Plate 50 is fixedly secured to diaphragms 54 which, through the reciprocating of rod 40, provides a differential in pressure to pump air or fluid. Diaphragms 54 are secured beneath spacers 56 and end wall 57 and a cover plate 58 is received on the outer extremities of spacers 56 and secured to housing 12 and end wall 57 by a plurality of threaded bolts 60. Each cover plate 58 is provided with an inlet opening 62 which has check valves to prevent return of air or fluid being pumped by pump attachment 10. An outlet pipe 64 secured to cover plates 58 provides exit means for the air or fluid under pressure being pumped by pump attachment 10.

In operation, shaft 22' is driven by an electric drill or motor rotates and the worm 30 rotates the worm gear 32 which by means of the offset pin 36 attached and within slot 38 creates a reciprocating action to rod '40 and through means of the fulcrum pin 42, arms 46 attached to the end of rod 4t! urge diaphragms 54 inwardly and outwardly to create a differential in pressure and through check valve means (not shown) air or liquid is pumped under pressure through outlet pipe 64.

It shall be noted that the outlet pipe 64 may be threaded to receive various type adaptors.

It shall further be noted that the internal bracket 44 providing support means through fulcrum pin 42 to reciprocating rod 40 provides a means for making and maintaining a constant and non-erratic motion to diaphragms 54 and further provides a means of reducing to a minimum the stresses upon diaphragms 54.

While various changes may be made in the detail. construction, it shall be understood that such changes shallbe within the spirit and scope of the present invention as defined by the appended claims.

What we claim as new and desire to protect by Letters Patent of the United States is:

1. A pump attachment for electric drills and motors comprising in combination an elongated hollow housing providing enclosure means for a drive shaft carried by said housing, a pair of spaced apart diaphragms, a reciprocating rod of elongated configuration carried within said housing providing a means for actuating said pair .of spaced apart diaphragms which create a differential in pressure to place air or fluid under pressure, a worm secured on said shaft, a worm gear carried within said housing and engaged with said worm providing means for imparting reciprocating action to said reciprocating rod, a pair of spacers, a pair of cover plates carried by said housing providing chamber means for the ingressing of air or fluid to be pumped from said pump attachment, clamp means carried by said housing providing a means for clamping said housing to an electric drill to drive said pump attachment and a thumb screw which together with said clamp means are secured on one end of a rectangular plate, said rectangular plate being secured at its other end to one side of said housing of said device.

2. The combination according to claim 1 wherein one end of said drive shaft containing said worm is secured within the chuck of said drill and the other end of said drive shaft is received within a bushing, said bushing being vsecured within an internal projection of said housing and supports said shaft within said housing, and an offset pin of said worm gear is freely and slidably received within an elongated slot in one end of said reciprocating rod and thus when said worm gear is rotated, said offset pin reciproc-ates said reciprocating rod within said housing.

3. The combination according to claim 2 wherein a fulcrum pin is freely and rotatably received within said reciprocating rod and supports said rod by means of an internal bracket which receives said fulcrum pin within said housing of said device.

Patented Apr. 26, 1966 4. The combination according to claim 3 wherein a pair of oppositely opposed arms are pivotably received on the end of said reciprocating rod and a pair of pivot pins and the other ends of said arms are pivotably received by pivot pins secured to a pair of circular plates secured to said pair of spaced apart diaphragms, said diaphragms are moved alternately back and forth to provide a differential in pressure through means of check valves and delivers air or fiuid under pressure from an outlet pipe.

5. The combination according to claim 4 wherein spacer means provide clamping means to said diaphragms and an end wall of said wall through cover plates received on the outer extremities of said spacers and said cover plates and said spacers freely receive threaded bolts which are threadingly received within openings of one end of said housing and said end wall, thus securing said diaphragms and forming fluid chambers within said device.

References Cited by the Examiner UNITED STATES PATENTS 1,765,698 6/1930 Persons 103-152 X 2,157,132 5/1939 Joy 103-152 X 10 3,152,340 10/1964 Fry et al. 10315O X ROBERT M. WALKER, Primary Examiner. 

1. A PUMP ATTACHMENT FOR ELECTRIC DRILLS AND MOTORS COMPRISING IN COMBINATION AN ELONGATED HOLLOW HOUSING PROVIDING ENCLOSURE MEANS FOR A DRIVE SHAFT CARRIED BY SAID HOUSING, A PAIR OF SPACED APART DIAPHRAGMS, A RECIPROCATING ROD OF ELONGATED CONFIGURATION CARRIED WITHIN SAID HOUSING PROVIDING A MEANS FOR ACTUATING SAID PAIR OF SPACED APART DIAPHRAGMS WHICH CREATE A DIFFERENTIAL IN PRESSURE TO PLACE AIR OR FLUID UNDER PRESSURE, A WORM SECURED ON SAID SHAFT, A WORM GEAR CARRIED WITHIN SAID HOUSING AND ENGAGED WITH SAID WORM PROVIDING MEANS FOR IMPARTING RECIPROCATING ACTION TO SAID RECIPROCATING ROD, A PAIR OF SPACERS, A PAIR OF COVER PLATES CARRIED BY SAID HOUSING PROVIDING CHAMBER MEANS FOR THE INGRESSING OF AIR OR FLUID TO BE PUMPED FROM SAID PUMP ATTACHMENT, 